Here are people who are said to have played with Jerry who remain un-pinned down in Jerrybase because we don't have enough data specificity. Add more in comments!
Randy Bachman: "he played his fingers raw with Jerry Garcia, Leslie West and Delaney Bramlett" on the Festival Express (
Byron Berline: OAITW, ca. summer 1973
Donny (or Danny?) Hanna: Orlando based rock guitarist and bassist, bands Power and New Days Ahead. "Hanna has played with Jerry Garcia of the Grateful Dead" (McAleenan 1972).
Bernard Purdie: JGMS Bottom Line 11/74
Ike Stubblefield: JGB 1970s
Ross Valory (phantom)